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Organization and Summary of Significant Accounting Policies - Summary of Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Assets:    
Held-to-maturity securities $ 14.4 $ 14.4
Promissory notes 14.9 14.1
Liabilities:    
Long-term debt 3,525.7 3,627.7
Recurring    
Liabilities:    
Deferred compensation 0.4 0.4
Recurring | Level 1    
Liabilities:    
Deferred compensation 0.4 0.4
Recurring | Level 2    
Liabilities:    
Deferred compensation 0.0 0.0
Recurring | Level 3    
Liabilities:    
Deferred compensation 0.0 0.0
Nonrecurring    
Assets:    
Held-to-maturity securities, fair value 15.5 15.2
Promissory notes, fair value 19.4 19.2
Liabilities:    
Long-term debt, fair value 3,673.0 3,740.6
Nonrecurring | Level 1    
Assets:    
Held-to-maturity securities, fair value 0.0 0.0
Promissory notes, fair value 0.0 0.0
Liabilities:    
Long-term debt, fair value 0.0 0.0
Nonrecurring | Level 2    
Assets:    
Held-to-maturity securities, fair value 12.4 12.1
Promissory notes, fair value 19.4 19.2
Liabilities:    
Long-term debt, fair value 3,673.0 3,740.6
Nonrecurring | Level 3    
Assets:    
Held-to-maturity securities, fair value 3.1 3.1
Promissory notes, fair value 0.0 0.0
Liabilities:    
Long-term debt, fair value $ 0.0 $ 0.0